Mathematics, 12.08.2021 14:50 joc223
You want to obtain a sample to estimate how much parents spend on their kids birthday parties. Based on previous study, you believe the population standard deviation is approximately
σ
=
28.1
σ
=
28.1
dollars. You would like to be 90% confident that your estimate is within 3 dollar(s) of average spending on the birthday parties. How many parents do you have to sample?
Answers: 3
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